NDLI: Measurement-Driven Methodology for Evaluating Processor Heterogeneity Options for Power-Performance Efficiency

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Measurement-Driven Methodology for Evaluating Processor Heterogeneity Options for Power-Performance Efficiency

Content Provider	ACM Digital Library
Author	Song, William J. Bose, Pradip Buyuktosunoglu, Alper Cher, Chen-Yong
Abstract	It is generally perceived that heterogeneous multicore processors will provide better performance and power efficiency over conventional homogeneous cores. However, heterogeneity can also be achieved within a homogeneous core design, instantiated under different voltage-frequency settings or per-core simultaneous multi-treading (SMT) modes. In this paper, we pursue an architectural study motivated by the question, "Can we get by with a single, complex SMT-equipped core design that can operate at different voltage-frequency points? Or, is it mandatory to invest into two different core types, one complex and the other simple?" We propose a systematic, measurement-driven methodology to evaluate processor heterogeneity options. Our analysis particularly focuses on the domain of real-time constrained embedded processors. The study is based on a direct measurement of two real processors; one that uses simple in-order cores, and another that uses complex out-of-order cores. The effect of heterogeneous core composition (consisting of complex and simple cores in the same chip) is analytically projected from measurements gleaned from the two different systems. Our analysis yields new interesting insights. When dealing with two core types without SMT enabled, true core heterogeneity does not necessarily provide better performance or power efficiency under area and power constraints. If the complex-core homogeneous processor invokes SMT, it outperforms true heterogeneity by offering 28% better power efficiency, assuming that simple cores in the heterogeneous system operate only in single-threaded mode without SMT capability. If the small cores employ SMT, true heterogeneity yields 32% better power efficiency than the homogeneous processor with SMT.
Starting Page	284
Ending Page	289
Page Count	6
File Format	PDF
ISBN	9781450341851
DOI	10.1145/2934583.2934637
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2016-08-08
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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